// this function is need to work around 
  // a bug in IE related to element attributes
function hasClass(obj) {
	var result = false;
	if (obj.getAttributeNode("class") != null) {
		result = obj.getAttributeNode("class").value;
	}
	return result;
}   

function stripe(className) {
	
	// the flag we'll use to keep track of 
	// whether the current row is odd or even
	var even = false;
	
	// if arguments are provided to specify the colours
	// of the even & odd rows, then use the them;
	// otherwise use the following defaults:
	var evenColor = arguments[1] ? arguments[1] : "#fff";
	var oddColor = arguments[2] ? arguments[2] : "#eee";
	
	// obtain a reference to the desired table
	// if no such table exists, abort
	var tables = getElementsByClassName(className);
	
	for(var tableCount = 0; tableCount < tables.length; tableCount++){
		
		var table = tables[tableCount];
		
		if (! table) { return; }
		
		// by definition, tables can have more than one tbody
		// element, so we'll have to get the list of child
		// &lt;tbody&gt;s 
		var tbodies = table.getElementsByTagName("tbody");
		
		// and iterate through them...
		for (var h = 0; h < tbodies.length; h++) {
		
			// find all the &lt;tr&gt; elements... 
			var trs = tbodies[h].getElementsByTagName("tr");
			
			// ... and iterate through them
			for (var i = 0; i < trs.length; i++) {
			
				// avoid rows that have a class attribute
				// or backgroundColor style
				if (!hasClass(trs[i]) && ! trs[i].style.backgroundColor) {
				
					// get all the cells in this row...
					var tds = trs[i].getElementsByTagName("td");
					
					// and iterate through them...
					for (var j = 0; j < tds.length; j++) {
					
						var mytd = tds[j];
						
						// avoid cells that have a class attribute
						// or backgroundColor style
						if (! hasClass(mytd) && ! mytd.style.backgroundColor) {
							mytd.style.backgroundColor = even ? evenColor : oddColor;
						}
					}
				}
				// flip from odd to even, or vice-versa
				even =  ! even;
			}
		}
	}
}



function getElementsByClassName(classname, node)  {
    if(!node) node = document.getElementsByTagName("body")[0];
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
        if(re.test(els[i].className))a.push(els[i]);
    return a;
}

function formfocus(){
	var inputs = document.getElementsByTagName('input');
	
	for(var i = 0; i < inputs.length; i++){
		var input = inputs[i];
		if(input.type != "hidden" && checkHiddenParent(input, true)){
			input.focus();		
			break;
		}
	}
}

function checkHiddenParent(elem, hidden){
	if(elem == null || hidden == false){
		return hidden;
	} else {
		var parentElem = YAHOO.util.Dom.getAncestorBy(elem, function(){return true;});
		
		if(YAHOO.lang.isNull(parentElem)){
			return checkHiddenParent(null, hidden);
		} else if((parentElem.style.display == 'none' || parentElem.style.visibility == 'hidden')){
			return checkHiddenParent(parentElem, false);
		} else {
			return checkHiddenParent(parentElem, hidden);
		}
	}	
}

function clearDefault(el) {
  if (el.defaultValue==el.value) el.value = ""
}

//YAHOO.util.Event.on(window, 'load', formfocus);